Telephone attachment.



A. SOHLOSSER.

TELEPHONE ATTACHMENT.

APPLICATION FILED MAY 14, 1912.

Patented Apr. 8, 1913.

ATTORNEYS COLUMBIA PLANOGRAPH cq; WASHINGTON. n. c.

ADOLPH SGHLOSSER, OF DODGE, NEBRASKA.

TELEPHONE ATTACHMENT.

Specification of Letters Patent.

Patented Apr. 8, 1913.

Application filed May 14, 1912. Serial No. 697,174.

To all whom it may concern Be it known that I, ADOLPH SCHLOSSER, acitizen of the United States, and a resident of Dodge, in the county ofDodge and State of Nebraska, have invented a new and Improved TelephoneAttachment, of which the following is a full, clear, and exactdescription.

This invention relates to improvements in telephone attachments, and hasparticular reference to devices of this character devised for thepurpose of detecting the interference with party lines due tounauthorized parties listening to a conversation.

An object of this invention is to provide a detector of the natureindicated which will be simpler and more effective than those on.dinarily proposed heretofore.

The foregoing and other obiects of the invention will be hereinafterfully described and claimed, and illustrated in the accompanyingdrawings in which like characters of reference indicate correspondingparts in all the views, and in which Figure 1 is a front elevation of atelephone set, showing the invention applied thereto, a portion of thecasing being broken away; Fig. 2 is a transverse section substantiallyon the line 22 of Fig. 1; Fig. 3 is an enlarged detail of theimprovement applied to the inher wall of the casing; and Fig. 4 is adetail described below.

By way of illustration of a preferred adaptation of the invention, Ishow a wall set comprising any preferred design of casing 10, atransmitter 11, and a receiver 12 suspended on the hook or receiver arm13 in the usual manner. The parts so far described are or may be of anyapproved construction.

The invention is shown as comprising an auxiliary transmitter 14,connected in series with the transmitter 11, and supported as upon abracket 15 on the bottom of the casing. The mouth of the auxiliarytransmitter is shown directed toward the left wall of the casing.

Between the auxiliary transmitter and said wall and preferably connectedto the wall is a plate 16 upon which is mounted a bell 17. An auxiliaryplate 18 is supported upon a series of studs 19, 19 and 19" connected tothe plate 16. A hammer 20,

adapted to ring the bell 17 is shown carried by a short lever 21 pivotedat 22 on a shaft journaled in the plates 16 and 18 and with connected tothe lever 21 and bearing upon the stud 19. One end of the lever 21 isprovided with an extension or finger 24 pivoted at 25 on the mainportion of the lever and on an axis parallel to the axis of the pivot22, and by contact with a shoulder 21, said finger constitutes asubstantially rigid extension of the lever in one direction, but thefinger is free to swing independently of the le ver in the directionopposite from the shoulder. The finger 24 is normally held in theposition in which it constitutes an extension of the lever by a spring26 connected at one end to the lever 21 and at its other end to :1 lug27 extending from the finger.

The aforesaid receiver arm 13 is adapted to oscillate in the usualmanner in a slot 28 in the sidewall of the casing. To said arm isconnected a projection of any suitable nature whereby when the arm 13swings upwardly on account of the removal of the receiver therefrom, itwill cause an engagement to be made with the lever 21 or its extensionfinger, causing the lever to rock on its pivot 22 and causing the hammer20 to swing away from the bell 17 against the tension of the spring 23.The extension referred to is shown in this case as consisting of a clip29 stamped preferably out of sheet metal, and thereby secured to the arm13 as shown in Fig. 3. Said clip includes an extension 30 extendinglaterally into position to engage the outer end of the finger 24 whenthe arm 13 swings upwardly as before described. The arrangement of theparts is such that the arm 13 will swing upwardly far enough for theextension 30 to pass the finger 24 after having lifted it and thusallowing the reverse swing of the lever 21, whereby the spring 23 willcause the hammer 20 to ring the bell. The parts 21 and 24, therefore,will assume their normal positions. When the arm 13 swings downwardlytonormal position when the receiver is hung upon it, the extension 30 willride over the finger 24, causing it to swing on its pivot 25 against thetension of the spring 26 without disturbing the position of the lever 21or the hammer 20.

From the foregoing description it will be understood that when a partyis carrying on a conversation with another party in the proper manner,if an unauthorized person should take down his receiver to listen fromanother station, the authorized party or parties will, of course, begiven a signal, due to the ringing of the bell 17 in the mannerdescribed, such signal being transmitted through the auxiliarytransmitter 14. By making the bells 17 in the several party stations ofdifferent tone or quality, their identity may be observed by theinterested parties and by this manner the offending party may belocated.

The several parts of this improvement may be made of any suitablematerials, and the specific construction and arrangement thereof may bevaried without departing fromthe spirit of the invention.

Having thus described my lnventlon, what I claim as new and desire tosecure by Letters Patent is:

In a telephone attachment, the combination with a casing and receiverarm pivoted therein, of a lever pivoted within the easing adjacent saidarm and having an end recess forming a shoulder, a finger constitutingan extension of the lever in one direction, the axis of the lever pivotbeing at right angles to the axis of the arm pivot, said finger beingpivoted to the lever in said recess on an axis parallel to that of thelever and adapted to swing freely in one direction and having a springto resist such free movement and maintain it in normal contact with saidshoulder, a bell within the casing, a hammer for the bell secured tosaid lever and adapted to sound the bell when the lever is swung in onedirection, and an extension carried by said arm to rock said leverthrough contact with the finger there of in one direction to ring thebell.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ADOLPH SCHLOSSER.

Witnesses:

JAMES H. H0011, WILL R. HRABAK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

